Where should I go next?

For the last 3 weeks I've been traveling with a friend from high
school and her husband, for the last week I've been traveling also
with a French guy named corto. He left today on his way to Malaysia.
He could practically be there by now. He's the first real traveler
I've met, he's been out 6 months and was in turkey Syria Iran Pakistan
and Bangladesh before coming here. Pretty legit. Her moved on now and
next week my friends fly to china and I'm alone. I'm sort of looking
forward to being alone, but haven't decided where to go.
It gets real hot on the mainland starting end of march to April, then
the monsoons come. So I figure I gotta do some inland stuff in the
small window I have till that happens. So my plan now, and this
changes daily, is to cross into burma for a couple of days just to
renew my Thai visa for 14 more days. Take a week or two to move up
through Thailand to Laos then spend a week or two in Laos. There are
some river ferries (like 2 days to a week long) that sound really cool
in Laos. Then toward April 1. Who knows gulf islands of Thailand for a
bit maybe then on to Malaysia. And or Indonesia. This will all
probably change tomorrow, but I'm just trying to give an idea of what
I'm thinking in terms of.